/Engine/Source/Editor/UnrealEd/Classes/Commandlets/ListMaterialsUsedWithMeshEmittersCommandlet.h
Process the given particle system. For mesh emitters, output material paths that don't have bUsedWithParticleSprites flagged.
void ProcessParticleSystem ( [UParticleSystem](API\Runtime\Engine\Particles\UParticleSystem) * ParticleSystem, [TArray](API\Runtime\Core\Containers\TArray)< [FString](API\Runtime\Core\Containers\FString) > & OutMaterials )